Adjustable gun sights



SEARS?! ROE April 4, 1959 A. B. iMEoNE ETAL 2,881,524

ADJUSTABLE sun srsm's Filed Aug. 9, 1956 INVENTORS \"Z' 'J W a, 1 B

. g ATTORNEYJ United States Patent ADJUSTABLE GUN SIGHTS Anthony B. Simeone and Robert A. Simeone, Hamden, Conn.

Application August 9, 1956, Serial No. 603,083

7 Claims. (CI. 33-56) This invention relates to gun sights, and more particularly to an adjustable sight mounted upon the receiver of a firearm so that it may be readily accessible for adjustment in order to vary the elevation of the gun in order to adjust the sight for the particular distance at which the target is located.

As is well known, it is usual to adjust the rear sight of a firearm in a vertical direction to vary the elevation of the axis of the bore of the gun when the sights are lined upon the target depending upon the distance of the target from the shooter so as to compensate for the effect of gravity upon the projectile. Such adjustments should desirably be made readily and preferably should be manipulated at a point convenient for the operation so that adjustment may, for example, be efiected by the operator without removing his hand from the gun.

In addition it is necessary when making such adjustment to take into account not only the distance of the target but also the velocity of the projectile. Therefore, it is desirable to be able to vary the adjustment with different ammunition even though the same gun is used.

It is also desirable to be able to adjust the sight for windage so that a sight which may be used under all conditions should be one which is adjustable for windage, adjustable for the distance of the target from the gun, and also variable to take into account the type of ammunition which is employed or the velocity of the projectile.

It is contemplated by the present invention to provide a gun sight which will be capable of the necessary adjustments and which at the same time may be adjusted conveniently by the thumb or finger of the user of the gun without the necessity of having to remove the hand from the gun.

To this end we provide the rear sight of the firearm upon an L-shaped member slidably mounted upon a base element secured to the receiver of the gun so that this L-shaped member which carries the sight may be moved in a vertical direction. This movement is effected by means of a cam engaged with one arm of the L-shaped member, the cam being rotatably mounted at the side of the receiver. A manually engageable actuating member is provided to actuate the cam member, this manually engageable member being adjustably secured to the cam member so that it may be adjusted with respect thereto when changingjrom one type of ammunition to another.

One object of the invention is to provide a new and improved adjustable gun sight.

A further object of the invention is to provide a new and improved gun sight which may be mounted upon the receiver of the gun and elevated with respect to the receiver, the elevation being effected by means of a cam member engaging the sight-supporting member and actuated by a manually operable member disposed close to the grip of the firearm so that it is conveniently accessible.

A still further object of the invention is to provide an adjustable gun sight for firearms of the character described wherein the manually operated actuating member is adjustably secured to the actuating cam so that adjustment between these two parts may be effected according to the particular ammunition to be employed.

To these and other ends the invention consists in the novel features and combinations of parts to be hereinafter described and claimed.

In the accompanying drawings:

Fig. 1 is a side elevational view of a portion of a gun having my improved gun sight applied thereto;

Fig. 2 is a sectional view on line 22 of Fig. 1;

Fig. 3 is a horizontal sectional view on line 3-3 of Fig. 1;

Fig. 4 is a detail perspective view of the manually manipulated actuating member;

Fig. 5 is a detail perspective view of the actuating cam;

Fig. 6 is a perspective view of the base member or plate which carries the sight mechanism; and

Fig. 7 is a perspective view of the sight-supporting member and the sight carried thereby.

In Fig. 1 of the drawing is illustrated a portion of a firearm comprising a barrel 10. a receiver 11, and a grip portion 12. Mounted upon the side of the receiver and rigidly secured thereto is a base plate 13 (Fig. 6) secured to the receiver by screws 14 passing through openings 15 in the plate.

As shown in Figs. 3 and 6, this plate is provided with a dove-tailed guide slot 16 in which is slidably mounted the vertical arm 17 (Fig. 7) of an L-shaped sight-supporting member having a horizontal arm 18 which extends over the top of the receiver of the gun. The vertical arm 17 of this member is beveled at its side edges, as shown at 19, in order to fit snugly in the dove-tailed slot 16, and at the lower end of this arm is a pin 20 designed to be engaged by the actuating cam as will be hereinafter explained.

In the horizontal arm 18 of this L-shaped sight-supporting member is rotatably mounted a pin or shaft 21 (Figs. 2 and 7) having a threaded portion 22. This pin may be rotated by a button 23 secured at one end thereof. The arm 18 of the sight-supporting member is slotted, as shown at 24, and a sight member 25 has its base portion disposed within this slot and threadedly mounted upon the threaded portion 22 of the pin 21. With this construction when the pin is rotated in one direction or the other, the sight member 25 will be moved to the left or right, as shown in Fig. 2, so as to compensate for windage.

In order to move the sight-supporting member vertically so as to provide for proper elevation of the gun depending upon the distance of the target, means are provided to raise and lower this member. It is noted that the base plate 13 is provided on its outer face with arcuate raised ribs 27, and within these ribs an actuating cam comprising a disk-like member 28 (Fig. 5) is rotatably mounted. This member is held in place by a screw 29 (Fig. 3) passing through an opening 30 in the cam disk 28 and threaded into the base plate 13. The member 28 is provided with a spirally arranged cam slot 31 which, as shown, extends through the disk and in which the pin 20 of the L-shaped sight-supporting member is received.

It will be apparent that with this construction when the cam disk 28 is rotated, the arm 17 of the sightsupporting member wil be raised or lowered, thus providing proper elevation for the sight member 25.

In order to turn the cam disk 28, a manually engageable cup-shaped member 32 (Fig. 4) is secured thereto. This member, as shown in Fig. 2, has an outer wall 33 and step portions 34 and 35 at its periphery. The annular step portion 34 embraces the periphery of the cam disk 28, while the annular step portion 35 embraces the arcuate ribs or ridges 27 on the base plate 13. Winglike members 36 may be provided on the front surface of the manually engageable member 32 so that it may be readily engaged by the thumb or finger of the operator for rotation. The periphery of the member 32 is provided with indicia 37 which may cooperate with a fixed pointer or arrow 38 on the receiver 11 to indicate to the operator the particular adjustment of the sight at any position of rotation of the member 32.

In order to prevent accidental rotation of the member 32 and cam 28 spring-pressed detents 39 (Fig. 2) may be provided in the ribs 27, these detents engaging the inner surface of the member 32 so as to releasably hold it in position to which it is moved.

In order to secure the member 32 nonrotatably but at the same time adjustably to the member 28, the latter may be provided with fine teeth or serrations 40 upon its outer periphery, which serrations are adapted to engage similar serrations 41 upon the inner peripheral surface of the step portion 34 of the member 32. When, therefore, the member 32 is clamped snugly against the outer surface of the member 28, the ridges provided by these serrations will engage to eifect a nonrotatable connection between these elements.

To hold the members 32 and 28 together, the latter is provided with threaded openings 42 to receive screws 43 (Fig. 2) which extend through arcuate slots 44 in the front plate 33 of the member 32. This provides an adjustable connection between the actuating member 32 of the cam 28 so that the former may be adjusted with respect to the latter and with respect to the cam slot 31 according to the ammunition which is to be used in the firearm. It will be understood that when the screws 43 are backed off slightly, the member 32 can be withdrawn at short distance from the member 28 so as to release the engagement between the serrations 40 and 41 to permit rotative adjustment of the member 32 on the member 28. When the adjustment has been etfected, the screws 43 will be tightened and the parts will be held rigidly together.

As will be apparent, the member 32 may be rotated by engagement of the thumb of the operator with the wing members 36 when the operators hand is upon the grip 12 of the firearm so that adjustment of the sight to elevate or reduce the elevation of the gun may be readily and conveniently effected. When this member is rotated, the spiral slot 31 in which is received the pin 20 on the L-shaped sight-supporting member will effect movement of the latter member in a vertical direction, moving the pin 20 away from or toward the axis of rotation of the member 28. The amount of adjustment made may be readily read from the one of the indications 37 which lies opposite the member 38 upon the receiver.

It will be understood that'the cam disk 28 may be readily removed from the structure by removal of the member 32 so that it may be replaced by another disk having a cam groove 31 of a difierent configuration. The particular configuration of the groove 31 will be different for diiferent guns, depending upon the trajectory of the projectile which is usually flatter in guns of smaller caliber as compared with those of larger caliber.

While we have shown and described one embodiment of our invention, it will be understood that it is not to be limited to all of the details shown, but is capable of modification and variation within the spirit of the invention and within the scope of the claims.

What we claim is:

1. A gun sight comprising a base plate adapted to be secured to the receiver of the gun, a sight-supporting member, means securing said member to the base plate for vertical sliding movements with respect thereto, a cam member rotatably mounted on the base plate, interengaging means on said sight-supporting member and cam member to adjust the former member vertically upon rotation of the latter, an actuating member, means for securing said actuating member to the cam member for rotatable adjustment relative thereto, said carn member comprising a disk-like element having a cam slot therein,

- ing means comprising inter-engaging projections on the periphery of said disk-like element and the inner surface of the Wall of said cup-shaped actuating member, said cup-shaped member being provided with slots and headed screws passing through said slots and threaded into said disk-like member.

2. A gun sight comprising a base plate adapted to be secured to the receiver of the gun, a sight-supporting member, means securing said member to the base plate for vertical sliding movements with respect thereto, a cam member rotatably mounted on the base plate, interengaging means on said sight-supporting member and cam member to adjust the former member vertically upon rotation of the latter, an actuating member, means for securing said actuating member to the cam member for rotatable adjustment relative thereto, said cam member comprising a disk-like element having a cam slot therein, means on said sight-supporting member received in said slot, said actuating member comprising a cup-shaped member having a wall portion embracing the disk-like element, and said means for securing the actuating member to the cam member comprising an arcuate slot in one of said members, fastening means secured to the other member and received in said slot, and additional interengaging means on the edge of said disk-like member and the wall portion of said cup-shaped member to releasably hold them against relative rotation..

3. A gun sight comprising a base plate adapted to be secured to the receiver of the gun, a sight-supporting member, means securing said member to the base plate for vertical sliding movements with respect thereto, a cam member rotatably mounted on the base plate, interengaging means on said sight-supporting member and cam member to adjust the former member vertically upon rotation of the latter, an actuating member, means for securing said actuating member to the cam member for rotatable adjustment relative thereto, said cam member comprising a disk-like element having a cam slot therein, means on said sight-supporting member received in said slot, said actuating member comprising a cupshaped member embracing the disk-like element, said means for securing the actuating member to the cam member comprising an arcuate slot in one of said members, fastening means secured to the other member and received in said slot, arcuate ribs on said base plate within which said disk-like element is mounted, and detent means on said ribs and said actuating member to releasably hold the latter in position to which it is moved to adjust the sight-supporting member.

4. A gun sight comprising a base plate for attachment to the side wall of the receiver of a gun, an L-shaped sight-supporting member slidably secured to said plate, said member having a vertical arm slidably secured to said base plate, and a horizontal arm projecting over the upper surface of the receiver, means for adjusting said member vertically comprising a cam disk rotatably secured to the base plate and having a cam slot therein, a pin on the vertical arm of the sight-supporting member received in said slot whereby rotation of the cam disk efiects vertical movement of the sight-supporting member, a sight member secured to the latter for horizontal adjustment, an actuating member of cup-shaped form, the wall of which embraces the cam disk, and means for securing said actuating member to the cam disk for rotative adjustment with respect to the latter about the axis thereof including interengaging ridges and serrations on the periphery of said cam disk and the inner surface of the wall of said actuating member.

5. A gun sight comprising a base plate for attachment to the side wall of the receiver of a gun, an L-shaped sight-supporting member slidably secured to said plate, said member having a vertical arm slidably secured to said base plate, and a horizontal arm projecting over the upper surface of the receiver, means for adjusting said member vertically comprising a cam disk rotatably secured to the base plate and having a cam slot therein, a pin on the vertical arm of the sight-supporting member received in said slot whereby rotation of the cam disk effects vertical movement of the sight-supporting member, a sight member secured to the latter for horizontal adjustment, an actuating member of cup-shaped form, the wall of which embraces the cam disk, means for securing said actuating member to the cam disk for rotative adjustment with respect to the latter about the axis thereof, said base plate having arcuate guide ribs thereon, said cam disk being mounted within said ribs, the wall of said actuating member embracing said ribs, and detent means carried by said ribs and engaging the wall of said actuating member to releasably hold the latter in position to which it is moved.

6. A gun sight comprising a base plate for attachment to the side wall of the receiver of a gun, an L-shaped sightsupporting member slidably secured to said plate, said member having a vertical arm slidably secured to said base plate, and a horizontal arm projecting over the upper surface of the receiver, means for adjusting said member vertically comprising a cam disk rotatably secured to the base plate and having a cam slot therein, a pin on the vertical arm of the sight-supporting member received in said slot whereby rotation of the cam disk effects vertical movement of the sight-supporting member, a sight member secured to the latter for horizontal adjustment, an actuating member of cupshaped form, the wall of which embraces the cam disk, means for securing said actuating member to the cam disk for rotative adjustment with respect to the latter about the axis thereof, the means for securing said cup-shaped member to said cam disk comprising arcuate slots in the former, and fastening elements received in said slots and threadedly secured to the disk, and interengaging elements on the periphery of the disk and the inner surface of the wall of said cup-shaped member.

7. A gun sight as in claim 5 wherein the thickness of said cam disk is greater than the height of said ribs, and the wall of said cup-shaped actuating member is of interiorly stepped formation to embrace said cam disk and said ribs.

References Cited in the file of this patent UNITED STATES PATENTS 414,877 Dauchy et al Nov. 12, 1889 667,018 Kellogg Jan. 25, 1901 1,405,834 Gordon Feb. 7, 1922 1,980,933 Simons Nov. 13, 1934 

